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Here is a link to the 210L model:ftp://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-210l_user%27s%20guide_en-us.pdfDon't know if there is a wiring diagram but it does contain procedures for diagnosing problems pertained to your computer. Either way, if that circuit was shorted then you're probably looking at a new motherboard or sound card.

No you need a flashlight magnifing glass / open up the case and on the mother board usually on the bottom right side close to wires to the on switch will be one or mor groups of 6-8 pins with USB clearly marked under them. match them up with the plug as there is a blank if you look close.

on some mother boards there may be a connection in the middle left of the board.. bottom right is the most used.